| 摘要 |
PURPOSE:To accurately correct the variation of magnetic field, by adding the circuit capable of turning at <1>H frequency or less to the coil of <1>H decoupling irradiation side to make possible the irradiation detection of D signal and also making possible a locking mechanism obtained by the atomic nuclear resonance of solvent sample. CONSTITUTION:D nuclear irradiation signal is taken out from the connecting point 60 of the capacitors 56, 58. The connecting point 41 of the capacitors 38, 40 is the input terminal of hydrogen nucleus decoupling. Winding number of the coil 36 can be turned at 90MHz and the coil 62 is connected in series and then said coil 36 can be accurately turned at 13.8MHz by varying the capacitor 56. In order to prevent the leakage of 90MHz <1>H decoupling frequency to the terminal 60, an antiresonance is given at 90MHz by the coil 62 and capacitor 64 to set high impedance of this circuit. Hereby, a long-term integration is performed with a high accuracy by the inner locking of heavy hydrogen nucleus. |
